000			01970aab a2200205 4500
008			231127b1989 |||mr||| |||| 00| 0 eng d
022			_a0017-9310
100			_aPagliarini, Giorgio _9873584
245			_aSteady Laminar Heat Transfer in The Entry Region of Circular Tubes With Axial Diffusion of Heat And Momentum
300			_a1037-1052 p.
520			_aThe simultaneous development of the velocity and temperature profiles in circular tubes is analysed, accounting for axial diffusion of both momentum and heat. The axisymmetric problem is formulated in variational form by the weighted residuals Galerkin method and then numerically solved by the finite element method. Results obtained in the case of vanishing axial diffusion effects satisfactorily compare with previous boundary layer solutions ; in the presence of axial diffusion effects the solutions presented in the literature are scanty and do not always agree. The isothermal flow results, presented for Reynolds numbers ranging from 1 to 1000, show the appearance of the overshoots in the axial velocity profile, as well as the dependence on the axial coordinate and Reynolds number of the various axial momentum transfer processes—radial diffusion at the wall, convection and axial diffusion. The non-isothermal flow results, presented for the Prandtl number ranging from 0.1 to 100 and the Péclet number from 5 to 500, point out the effect of axial diffusion of momentum and, above all, of heat, on the convective heat transfer rate.
650			_aLaminar Heat Transfer _9869987
650			_aEntry Region _9879052
650			_aCircular Tubes _9869276
650			_aAxial Diffusion _9879053
650			_aHeat and Momentum _9879054
773	0		_dNew York, U.S.A : Pergamon Subsidiary of Elsevier Science & Technology _tInternational Journal of Heat and Mass Transfer _x00179310
856			_uhttps://www.sciencedirect.com/science/article/pii/0017931089900057
942			_2ddc _n0 _cART _o14993 _pMr. Muhammad Rafique Al Haj Rajab Ali (Late)
999			_c814384 _d814384